Pump



Patented Jan. 29, 1946 UNITED STATES PATENT OFFICE PUMIf Loran O} Wallen", Menomonee Falls, Wisr,v assignor, by: mesne assignments. to Hydro Mfg. Co. Inc., Milwaukee, Wis. Application November 22. 194:, Serial No. 511,213

2 Claims.

The present invention relates in general to improvements in the art of pumping fluids, and relates more specifically to various improvements in the construction and operation of hydraulic pumps ing the improvements, may be had-by referring to the drawing accompanying and forming a part of this specification wherein like reference char acters designate the same or similar parts-in the or the like. 5 various views.

Generally stated, an object of the present in- Fig. I is a central vertical section through one vention is to'provide animproved pump which is of the improved hydraulic pumps showing the 1simple in construction and efficient in operasame applied to a liquid supply source or resetion. voii';

Many difierent types of hydraulic pumps have Fig. 2 is a transverse horizontal section heretofore been used extensively for diverse purthrough the pump of Fig. 1, taken along the line poses, and in some of. these prior pumps the liq- 2-2; and uidwas withdrawn by suction from a supply res- Fig. 3 is a reduced external side view of the ervoir past an inlet valve by means of a recip'roimproved pump, showing the pump plunger accable plunger, and was forced by the. latter past tuating eccentric. applied thereto. a discharge valve to a zone of utilization of liquid While the invention has been shown and deunder ressure from which the liquid could be scribed herein as being especially applicable to a returned directly to the source of supply past small electric motor driven liquid pump for aca lay-pass valve. While some of these previous tuating hydraulic shears or the like, it is not my reciprocatin plunger hydraulic pumps equipped desire or intent to thereby unnecessarily restrict with by-pass return valves, were quite satisfacthe utility or adaptations of the improvement. tory' in operation, most of them were either too Referring to the drawing, the improved hybulky for use in limited quarters, or too comdraulic pump assemblage shown therein, 'complicated to manufacture at reasonable cost, and prises in general, a one-piece main casing 5 havmany of these prior devices were moreover relamg therein two parallel vertical laterally spaced tively unreliable and inefliicent in operation. outer bores 6', 1 and an intermediate upright bore It is therefore a more specific object of the 8, the bores 6,8 being. connected at their lower present invention to provide an improved hyends' by a horizontal passage 9 and the bores draulic pump assemblage which is extremely sim- 1, 8 being likewise connected intermediat their ple and compact in construction, and whichis ends by a tby-passpassage Ill; a cylindrical pump furthermore highly dependable and eificient in plunger ll reciprocable within the outer bore 6 use. in' any suitable manner, as by means of a re- Another specific object of this invention is to volving eccentric [2; a liquid outlet pipel3 comprovide various improvements in the construction municating with the upper extremity of the inand operation of reciprocating plunger liquid termediate casing bore 8 and being connected to pumps equipped with liquid return by-pass means, a zone of utilization of liquid under pressure, not whereby such assemblages'may be manufactured shown; a relief valve piston or rod l4 adjust! expeditiously and at moderate cost. able within the outerborel to control the de- Still another specific object of the invention is livery of liquid from the bore 8 through the to provide a simplified pump structure which can 40 passage I0 to a liquid return port [5 disposed in be readily assembled and dismantled, all parts of line with the passage ill; a ball type discharge which are convenientlyaccessible for inspection, or pump outlet valve l6 disposed in the lower and which is adapted for diverse uses. end of the bore'8 and being communicable with An additional specific object of my invention is the passage 9; a poppet type suction or inlet valve to provide a new and useful power driven pump ll mounted in a separable fitting l8 at the x= assemblage which can be maintained in clean and treme lower end of the pump bore 6; and a liqsanitary condition with minimum attention, and uid supply reservoir 19- within which the casing which comprises a fewest number of readily ma- 6 is suspended by means of a removable reservoir chinable and standard parts. cover plate 20.

These and other specific objects and advanso The main pump casing 5 may be formed by tag'es of the present invention will be apparent casting or otherwise, and is provided with an from the following detailed description. upper integral suspension flange 2| which may A clear conception of the several features conbe detachably secured as bybolts to the reservoir stituting my invention, and of the mode of con-. cover 20 so as to permit quick removal of the pump structing and operating hydraulic pumps embodyunit; and the bores-6, T, 8, passages 9,10, and

7 closed and sealed by means of a'pipe plug 22.

The reciprocable pump'plunger II which is snugly fitted within the upright bore 6,.is provided at its lower'extremity withf a'cup packing "24 and has its medial portion provided with an annular recess 23 having a drainage port -23 and this plunger Il may be rotated about its central axis so as to permit varied disposition of the driving eccentric l2, see Figs. 1 and 3. This eccentric l2 may be driven, by an --electric ered so as to cut off communication between rod l4 may be adjusted to assume any desired position within the bore 1 and if this rod is lowthe passage IO and ports I5, then the liquid passing the discharge valve [6 will be delivered to the V bore '8 and outlet pipe I3 under pressure. If, however, the by-pass valve I4 is open while the pump plunger H is reciprocating,vthen the liquid passing the'discharge valve l6 will be subjected to only slight pressure 'suificient to overcome the tension of the spring 21, and the liquid delivered to the bore 8 will return to the reser- V W voir l9 through the passage "land return port for recirculationf When the pump plunger motor mounted upon the reservoircover 20, or

' from any other suitable source of power; and is connected to the plunger ll by means-eta cona necting rod as shown mFig. 3. The liquid discharge pipe l3 may be caused to communi- 'cate with .a-hydraulic servo-motor for actuating.

a shear blade; or with a hydraulic jram, orsimi la'r'devi'ce wherein liquid under'pressure is supplied by a pump and from. which the pressure is relievedthrough'a by-passlto the same reservoir 19 which supplies the pump with liquid. The relief. valve pistonor .by pass rojd I4 is snugly fitted within the bore! of the'casing5, and may be adjusted along this bore'in any suitable manner so asto either close or open the liquid return port i5;"a'nd-tlie lower extremity offthe bore 1 is provided with a 'small'pressure 'relief and drainage opening. The valve rod Id while being snuglyQfitted 'within the bor'eQS, is also preferably provided with'an annular recess 25 for decreasing danger of leakage 'therealong,

. and which-likewise'has a drainage port 26, see

Figs, 2 and'3g- A set screw 25'. coacts with the V recess 26 so as to prevent the rod ld from being lifted out of the bore 1 by liquid pressure.

,l l is at rest, the by-pass valve or rod (may also be utilized to relieve the pressure existing in the zone of liquid pressure utilization, thus making the hydraulic system extremely simple but flexible in operation;

When it becomes desirable to inspect or remove any of the parts of the pump assemblage, the

'unit may be removed from the reservoir I3 and the plunger, rod 14; and pipe 13 may be dis-' connected from the structures normally associated therewith, whereupon the plunger ll may be freely withdrawn from'its bore G and the rod [4 may likewise'be withdrawn'from the bore 8..

The pipe plug 22 may then'be're'moved for inspection of the passage 9, and the valve lfiand spring 21 may be conveniently inspected upon removal of the upper fittingfl'. p Upon removal of the cap screws 28, thefsuction valve l1 and its supportingfittinglS may also be detached from the casing 5, thus permitting rapid and conven i'ent inspection of all parts of the'assemblage; Re-

' assembly of the structure may be just as readily The ball discharge valve 16 which is movable within the medial bore 8, is normally pressed against its seat by means of 'a helical compression spring 21. which reacts against the lowerv end of a fitting 2'|',-and-the.plug 22 and-fitting 21 maybe removed to permit free access tothe port 9', and to the .valve l6 and sprin 21. The fitting [8 upon which the suction valve 'll is mounted, is also detachably secured to the main casing 5 by means of several cap screws 28, and

is,..provided with inlet .ports 29 communicating with the interior of the liquid supply reservoir J9. Therpoppetinlet .valvel'l is normally held against its seat on the'fitting 18 by a helical compression spring 30 coacting witha pin 31 piercing the valve stem, but these springs 21, 39 may be omitted'when the pump is being operated at slow speed and in vertical. position. The liquid supply resevoir IS with which the ports 15, 29 communicate may be of any desired shape and capacity, but should always be provided with an abundant supply of liquid 32 the level of which should be maintained well above the. port. l5 inorder to preventair from entering the pres sure system. 4'

r V I I Duringnormal operation of the, improved hydraulicpump assemblage; after the supply reservoir [9 has been supplied with liquid '32; the pump plunger Il may be reciprocated with the aid of the revolving eccentric l2 thereby causing successive batches of liquid to be withdrawn from the reservoir l9fpast the inlet valve IT during the suction strokes and also causing these batches to be deliveredpast the outlet valve is during-the dischargestrokes. The by-pass valve effected, and the various bores, passages, ports andchambers may obviously be readily formed by simple drilling operations. 7 I p From the foregoing detailed description of the construction and operation o'fthe improved device, it will be apparent thatithe present invention provides an jimprovedhydraulic pump unit 7 which is extremely simple and compact in construction, and which ispmoreover highly efficient in operation and flexible in it's adaptations. The new pumping units can obviously be readily constructed with theaid of simple tools, and these units because of their limited dimensions may be readily arranged in multiple compact groups wherein all of the units may be-driven from a common motor or other power source. The improved structures may also be conveniently as-- sembled or dismantled thus. making ..'all parts quickly accessible for inspection, cleaning and repairs: and the simplicity and mode of .constructing also facilitates quantity production with interchangeable parts. The improved pumphas been found especially well adapted for operating hydraulic shears or the like wherein the "shear blade is actuated by a hydraulic servo mot'or, but is also adapted fordiversejother uses. 1. I It should be understood that it isnot desired to limit the invention to the exact details'fof'construction or to 'the precise mode of use, herein shown and' described, for various modifications within the scope of the appendedfclaimsfmay occur to persons skilled in the art. i 1 J I claim: Q, L 1. In a pump,a unitary casing having three laterally. spacedupwardly open: parallel upright bores and two vertically-spaced transverse bores of which the lower .bo'reconnectsonefouter'upright bare with the lower end of the'intermediate bore and opens-at one-side of the casing. while-the upper transverse bore connects the medial portions of the intermediate bore with the other outer upright bore and opens at the same casing side, the outer end of said lower transverse bore being plugged and the corresponding end of said upper transverse bore being open while the lower end of said first mentioned outer upright bore is enlarged, a pump plunger reciprocable in said first mentioned upright bore, a suction valve detachably confined within said bore enlargement, a ball discharge valve confined within said inter mediate bore between said transverse bores, a tubular discharge fitting screw threaded into the upper portion of said intermediate bore, a helical spring interposed between said fitting and said ball valve, a by-pass control piston slidable within said other outer upright bore and across said upper transverse bore, and a limit stop for said piston coasting therewith within its confining bore.

2. In a pump, a unitary casing having three laterally spaced upwardly open parallel upright bores and two vertically spaced transverse bores of which the lower bore connects one outer upright bore with the lower end of the intermediate bore and opens at one side of the casing while the upper transverse bore connects the medial portions of the intermediate bore with the other outer upright bore and opens at the same casing side, the outer end of said lower transverse bore being plugged and the corresponding end of said upper transverse bore being open while the lower end of said first mentioned outer upright bore is enlarged, a pump plunger reciprocable in said first mentioned upright bore, a suction valve detachably confined within said bore enlargement, a ball discharge valve confined within said intermediate bore between said transverse bores, a tubular discharge fitting screw threaded into the upper portion of said intermediate bore, a helical spring interposed between said fitting and said ball valve, a by-pass control piston slidable within said other outer upright bore and across said upper transverse bore, said piston having a p or- 1 tion of reduced diameter within its confining bore, a limit stop for said piston coacting with said casing and with said reduced piston portion, and ports connecting the upper and lowermost portions of said piston confiningbore with the exterior of said casing.

LORAN O. WALLEN. 

